There are more causes of dizziness and weakness, and the common causes are mainly the following: 1, hypertension. The incidence of hypertension is high, and the common symptoms are dizziness, headache, weakness, etc., caused by insufficient blood supply to the cerebral arteries. 2, cerebrovascular disease. Including cerebral infarction and cerebral hemorrhage, etc. Most cerebral infarction has a history of cerebral arteriosclerosis and is prone to develop in a quiet state, while most cerebral hemorrhage has a history of hypertension, with symptoms such as headache, vomiting, numbness of one limb and impaired movement, etc. It is best to check the cranial MRI to confirm the diagnosis. 3, fever. Such as encephalitis, cold, pneumonia and other diseases, patients with high fever may have headache, dizziness, weakness and other symptoms. It is better to take the temperature first, find out the cause of fever and treat the symptoms. Poor quality of sleep, taking certain drugs, carbon monoxide poisoning, etc. can also cause the above symptoms, the appearance of the above symptoms, it is best to further examination to confirm the diagnosis.